3 2 · 1

Lithium, Li, element 3

Alkali metal· Period 2· Group 1· s-block

Configuration [He]2s¹

Atomic weight: 6.94Da
Phase: solid
Density: 0.534g/cm³
Melting point: 453.65K 180.5 °C
Boiling point: 1,615.15K 1,342 °C
Electronegativity: 0.98

Socket silvery metal. First member of group 1 of the periodic table. Lithium salts are used in psychomedicine. Description from mendeleev.

Back to the table

The outermost shell: the valence electronsThe inner shellsThe nucleus One bead for each electron, on the ring of its shell, counted from the nucleus out. The rings turn at their own pace; the model is Bohr's picture of the atom, which places electrons in shells but not on true orbits.

Atomic properties

4 of 5 fields have a value for lithium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.: 6.94Da; Source: mendeleev
Electron configuration: [He]2s¹; Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.: 1s²2s¹; Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.: 2 · 1; Source: Worked outfrom electron configuration

No data uncertainty of the atomic weight.

Screening of each subshell

Clementi's screening constants: how much of the nucleus's charge the other electrons hide from an electron in each subshell. What is left is the effective nuclear charge it feels.

Subshell	Screening σ	Effective charge Z − σ
1s	0.3094	2.6906
2s	1.7208	1.2792